Platen printing press



Dec. 27, 1927. 1,653,838

A. BUTTNER PLATEN PRINTING PRESS Filed May 11, 1926 jhnwior:

Patented Dec. 27,

UNITED STATES 1,653,838 PATENT OFFICE.

. AB'IUB BU'TTNEB, OF HEIDELBEBG, GERMANY, ASSIGNOB T EGHNELLIP'RESSEN FABRIK AKTIEHGESELLSCHAFT HEIDELBERG, 0F HEIDELBERG, GERMANY, A COB- ronnrron or GERMANY.

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Application filed Kay 11, 1926, Serial No. 1Q8,371, and in Germany May 15, 1925.

My invention relates to platen printing presses; more especially, it relates to an automatic feeding and discharging device for presses of that t pe. A device of this kind 6 is described in t e specification Serial Number 714,695, filed May 20, 1924. In this device the feeding and discharging grippers rotate around an axis located vertically with respect to the platen plane, and the grip ers are operated positively in that a drivlng isk rotating with uniform speed engages peri odically, with equal intervals of time, guide slots of a control disk operatin the grip ers in such a manner that this disk and wit it the grippers are accelerated gradually from zero to a certain maximum and are t en retarded gradually from that maximum to zero.

For the correct feeding and discharging of W the sheets it is important that the grippers when being in their position of rest occupy always thesame places and are locked therein, and that, besides, the control disk which actuates the grippers is at rest just in the W proper positions in order to rovide for an undisturbed drive. It has, owever, been discovered that the control disk tends to move for a certain short length of way beyond the proper position of rest when a so certain play has developed between the parts owing to wear and tear of the same. When this occurs an undisturbed drive of the control disk is no more ossible.

Now, the object o the resent invention is to overcome the drawbac stated in the second half of the preceding paragraph, and I attain that object chiefly by preventing the control disk from rotary movement, or locking it respectively, in its positions of rest by to a suitably designed lockin device or mem her; The arrangemeiit an combination of the arts concerned are preferably such that the ocking member rotates together with the shaft driving the control disk and rotating with uniform s eed, and that the configuration of the 100 'ngmember is such that it acts upon the control disk only when this latter is no more driven by said shaft. The two members mentioned may be designed,

for instance, similar to a cylinder escapement.

The invention is illiistrated diagrammatically and by wayof example on the accompanying drawing on which Figure 1 is a side-view of the arrangement and combinat1on of parts constituting the locking device, and F1gure 2is a section in the plane I-I- of Fig. o

As in the arrangement and combination of parts shown in the above-mentioned former application the frame 1 of the platen press carries the main driving shaft 2 to which a disk 3 carrying two diametrically located small rolls 4 is afiixed. Below the shaft 2 another shaft 5 is supported in the frame 1, and secured to this shaft is the control disk 6 which is provided with a plurality of radial slots 7, of which there are four in the example shown. The arrangement of the rolls 4 and the slots 7 relativel to each other is such that the rolls engage .t e slots in certain intervals of time whereby the control disk 6 is turned partially, i. e. for 90 in the example shown. Every partial turning commences when a roll 4 is just entering into a 76 slot 7 and ends when the respective roll is Justicaving the respective slot, and every partial turning is transmitted to a horizontal shaft 10 by the intermediary of a WOIII181 afixed to the shaft 5, and a worm-wheel 8 meshing with said worm and secured to the shaft 10. The motion is transmitted further by a pair of bevel wheels 16 to a two-partedshafting 10 10 the two parts of which are connected with each other by a Garden-joint 9, and by a pair of bevel wheels 11, 12 to a shaft 14 located in the top of the platen 13 at right angles with respect to the plane of printing, and carrying at its other end the grippers 15 which oscillate in the plane of co the platen. .The Cardan-joint 9 is axially arranged to the shaft 24 carrying the platen 13. The latter rocks upon this shaft 24 and is actuated by the main shaft 2. Attached to the latter is a crank 25 which is connected 9:; with one end of a connecting-rod 26. The other end of this rod is jointed to the 'middle joint of a toggle-lever 27,28, the arm 27 of which is turnable on a bolt 29 afiixed to the frame 1 of'the machine ;,the other arm 28 100 of the toggle-lever is connected with the lower end of the platen 1'3 by means of a bolt .30, whereby the platen is caused to oscillate.

Now, in order to prevent the control disk 6 from continuing to move after one or the other of the rolls 4 has left it,'.and to hold it fast always in the same POSItlODS Of rest, the following device has been designed;

Afiixed to the shaft 2 is, besides the disk 3, another disk 23 havin two oppositely located circularly curve recesses; in other words: The circumferential surface of the disk 23 consists of two convex portions and two concave ones. Also the disk 6 which resembles a star-wheel has circularlycurved recesses, but four instead of only two, and the curvature of the recesses, as well as their len h corresponds to the curvature and the ength of the convex portions of the disk 23. When the slotted disk 6 is in one of its positions of rest, one of the convex portions of the disk 23 lies in one of the recesses of the disk 6, as shown in full lines in Fig. 1, in which a part of the disk 3 is broken away in order to show the parts lying behind it. As the disks 3 and 23 are rotating continuously, the respective convex portion of the-disk 23 passes through the respective concave portion of the-disk 6, and when the roll 4, following that convex portion is just entering into the slot 7 now concerned, said convex portion has passed 15 through one half of the concave portion in whichjt is still artly located. The respective roll 4 is t en in the position indicated by the dotted roll 4 and the respective convex portion in the position indi cated by the numeral 23 so that a partial turning of disk 6 can take place.

It is obvious that the slotted disk 6 is completely prevented from even the slight est further partial turning as long as it is locked by the disk 23, and it is always securely held in such a position that each roll 4 can enter smoothly the slot 7 just concerned. The device operates like a cylinder esca ement as employed in connection with watc es, but I wish it to be understood that I do not restrict myself solely to this particular type of a locking-mechanism, as also other types or designs of such mechanisms may be used in connection with the invention without departing from the gist thereof.

I claim:

1. A platen printing press, comprising in combination, a platen, a frame in which the platen is mounted for rocking movement, grippers'for the sheets to be printed turnable on said platen, a take-around, a main shaft to which the take-around is fixed, a second. shaft journalled in the said frame, a slotted member fixed to said second shaft, said take-around being arranged to intermittently engage the slots of said slotted member and the latter having in its circumference concave recesses between said slots, a checking disc fixed on said main shaft and arranged to engagesaid concave recesses and to intermittently lock said slotted member, and means for transmitting the intermittent motion of said slotted member to said gripers.

p 2. A platen printing press, comprising in combination a platen, a frame in which the platen is mounted for rocking movement, grippers for the sheets to be printed, turnable on said platen, a main shaft, a disc fixed to the main shaft, a number of rolls turnably arran ed on said disc, a second shaft journalle in said frame, second disc having a number of radial slots and fixed to said second shaft, said rolls being arranged to engage said radial slots and to intermittently rotate said slotted disc, the latter having in its circumference concave recesses between said slots; 'a checkin disc fixed on said main shaft, said checking disc having in its circumference recesses and having a diameter the radius of which corresponds to the radius of curvature of said concave recesses, the latter and the remaining rimportions of said checking disc being arranged to cooperate with each other to lock said slotted disc in its position of rest, and means for transmitting the intermittent motion of said slotted grippers.

In testimony whereof I have aflixed my 90 a signature.

ARTUR BUTTNEB- 

